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EXHAUST EMISSION CONTROL SYSTEM OF LEAN COMBUSTION INTERNAL COMBUSTION ENGINE AND EXHAUST EMISSION CONTROL METHOD OF LEAN COMBUSTION INTERNAL COMBUSTION ENGINE
EXHAUST EMISSION CONTROL SYSTEM OF LEAN COMBUSTION INTERNAL COMBUSTION ENGINE AND EXHAUST EMISSION CONTROL METHOD OF LEAN COMBUSTION INTERNAL COMBUSTION ENGINE
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机译：稀燃内部燃烧发动机的排放控制系统和稀燃内部燃烧发动机的排放控制方法
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摘要
PROBLEM TO BE SOLVED: To provide an exhaust emission control system of a lean combustion internal combustion engine which can restore a methane purification property of an oxidation catalyst device for purifying methane without impairing drivability, and an exhaust emission control method of the lean combustion internal combustion engine, in the lean combustion internal combustion engine using compressed natural gas as fuel.SOLUTION: In a lean combustion internal combustion engine using a compressed natural gas as fuel, and having an oxidation catalyst device 29 in an exhaust passage 28 and a control device 40, the control device lean-operates the lean combustion internal combustion engine during the acceleration and a cruise operation of a vehicle which is mounted with the lean combustion internal combustion engine, oxides a treatment objective component in an exhaust gas G by using the oxidation catalyst device, rich-operates the lean combustion internal combustion engine at the deceleration of the vehicle, performs purification rate restoration control for restoring a purification rate of the oxidation catalyst device, and holding a temperature of the catalyst by combustion, and when performing the purification rate restoration control, sets ignition timing so as to be retarded after a piston top dead point without generating torque.SELECTED DRAWING: Figure 1
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